Gun aligning device



W. S. SPIGELSKY GUN ALIGNING DEVICE Filed Oct. 20, 1945 IN V ENTOR MALL/4M c5 SP/GELSKY M a. 14 ,4 Z I fr! TTORNEYJ fatented Aug. 7, 1945 UNITED STATES PATENT OFFICE 2,381,010 I GUN AIJGNING DEvIcE William S. Spig elsky, Monessen, Pa.

Application October 20, 1943, Serial No 506,978

(Granted under the act of March 3, 1883, as amended April. 30, 1928; 370 0. G. 757

1 Claim.

the guns maybe trained on an object or target by a so-to-speak aiming of the craft.

Y A further object of the invention is to provide a device for readily determining the exact degree of pitch and lateral deflection of the bore of an aircraft gun with respect to a fixed predetermined but remote line of the craft in order to determine the degree of adjustment required to train the gun on a. line parallel with an airand comparable with trammel rod i5 is provided with at. least an end portion l1 so shaped as to fit into the bore of, a barrel-of a gun I! coaxially therewith.

In order to determine the vertical degree of angularity between the axes of the trammel rods i5 and I6, which instrumentally represent the axes of the fixed socket II and the bore of a gun .12, aprotractor I8 is mounted verticallyof or normal to'thetrammel bar portion M and transversely thereof, and in order to determine the horizontal, as distinguished from. the vertical,

craft thrust line or convergingly across such line at a predetermined point in advance of the craft.

Withthe foregoing and other objects and aims in view, my invention resides in the combination of parts and in the details of construction hereinafter set forth in the following specification degree of angularity between the" axes of the trammel rods l5 and I6, a'pr'otractor I9 is also mounted on a trammel bar portion I 4 in horizontal parallelism with the trammel rod Hi. The protractor I9. is positioned inregistrable relationship with the trammel rod it which is provided with an indicator 20 horizontally parallel with the axis of rod It and indicative of calibrations on that protractor. Similarly the trammel which the same may be practiced, being illustrated in the accompanying drawing in which: Fig. 1 is a perspective view of an embodiment of the invention illustrating an application thereof;

Fig. 2, a sectionalized front elevation of the ment of guns mounted in aircraft wings, and for this purpose it is contemplated that the wing ill be provided with a fixed socket Ii, the axis of which is predetermined, such as being in parallel with the thrust axis of the plane, the crank shaft or axis of the propeller shaft. Therefore, for use in aligning the axis of the bore of a wingmounted gun with the axis of the wing-provided socket It, I provide a trammel-like device including telescoping members l3 and i4 forming a trammel bar and from the extremities of which extend trammel rods l5 and IS. The trammel rod i5 is fixed to the trammel bar member i3 at a predetermined angle, 90 preferably, and

. isso shaped as to fit with precision into the socket ii coaxially therewith". The trammel rod it,

however, is hinged to the trammel bar member bar portion i3 is provided with an indicator 2! indicative of calibrations on protractor I 8. Indicator 2| is releasably-clamped to the bar portion l3, as by a band 22 and set screw 23,-and though the indicator is adjustable to different positions along the bar, to bring the same into registrable association with the protractor It on bar portion II, it is maintained in constant vertical angular relationship, preferably 90", with trammel rod I5 by means of a lug 24 carried by band 22and slidable in a slot or trough 15 in the trammel bar member is.

The sleeve member of the telescoping trammel bar, 1. e., trammel bar portion I4, is provided with a set screw 26 adapted to engage the bar portion l3 for fixing the axial as well as the rotative relationship between those bar portions when desired.

In using the device for gun alignment, setv screws 23 and 26 are loosened; portion ll of the'hinge connecting trammel rod i6 and bar member l4 and the telescoping members adjustt ed to a point where the bar rod l5 may be inserted into the socket ll. bore may then be brought into vertical as well as horizontal parallelism with the axis of the socket H by adjusting the members to-bring the indicator 2! in registery with a predetermined indicator 2! in registry with a predeterminedcalibration on protractor I8 indicating thatthe axis of the gun bore is brought into verticalparallelism with the axis of the socket. The gun is The axis ofthe gun' registers at a point on protractor l9 indicating a 90 angular relationship between the trammel rod l6 and the trammel bar members 03 and I4 and bringing the axis of the gun bore into horizontal parallelism with the axis of the socket II.

craft at the target, may train the guns thereon.

Having described my invention and illustrated an embodiment by which the same may be practiced, what I claim is:

An aircraft gun aligning device comprising a trammel-like device having a trammel bar including coaxial members adjustable axially and then adjusted horizontally until the indicator 20 rotatably, a trammel rod extending from one of said bar members in'fixed constant angularity therewith and adapted to project the axis of a' fixed socket, a second trammel rod hinged to the other of said bar members and adapted to project the axis of the bore of a gun, indicator means on one of said bar members and protractor means on the other of said bar members for determining the vertical angular relationship of said hinged rod with respect to said fixed rod, and indicator means on said hinged rod and protractor means on one of said bar members for determining the horizontal angular relationship I between said hinged rod and said bar, whereby a gun mounted on an aircraft may be aligned with the axis of a socket fixed in said aircraft in proximity with said gun and with its axis in predetermined alignment with a, predetermined line through said craft.

WILLIAM S. SPIGELSKY. 

